Peugeot Clef du Vin"Travel and Service" Wine Tool A patented metal alloy, the Clef du Vin is a calibrated instrument that reveals a wine's aging potential It works effectively on all types of wines: whites, sparkling, rose, reds and naturally sweet wines Each second the alloy disk is in contact with the wine will mimic one year's ageing: the effect is cumulative and irreversible Perfect for wine collectors, oenophiles and those who just enjoy wine 2 year warranty from the date of purchase